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  4. Two lenses of power -15 D and + 5 D are in contact with each other. The focal length of the combination is

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Q. Two lenses of power $-15\, D$ and $+ 5\,D$ are in contact with each other. The focal length of the combination is

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Solution:

$P=P_{1}+P_{2}=-10$
$t=\frac{1}{P} \Rightarrow 0.1\,m \Rightarrow -10\,cm$